just trigger one, then the other. Could someone advise whether bringing the pingpin back to low when the pingpin is in input mode is necessary? I figured it would be so that it still isn't reading while the next sensor is working. I added that into this code. This is untested, but it compiles. Let us know how it works.

void loop(){ // establish variables for duration of the ping, // and the distance result in centimeters: long duration; int cmL, cmR;

// The PING))) is triggered by a HIGH pulse of 2 or more microseconds. // Give a short LOW pulse beforehand to ensure a clean HIGH pulse: pinMode(pingPinLeft, OUTPUT); digitalWrite(pingPinLeft, LOW); delayMicroseconds(2); digitalWrite(pingPinLeft, HIGH); delayMicroseconds(5); digitalWrite(pingPinLeft, LOW);

// The same pin is used to read the signal from the PING))): a HIGH // pulse whose duration is the time (in microseconds) from the sending // of the ping to the reception of its echo off of an object. pinMode(pingPinLeft, INPUT); duration = pulseIn(pingPinLeft, HIGH);

// convert the time into a distance

cmL = microsecondsToCentimeters(duration); Serial.print(cmL); Serial.print("cmLEFT"); Serial.println(); delay(100); digitalWrite (pingPinLeft, LOW); // I don't know if this command is necessary, but it would make sense so it doesn't continue // to read while the next sensor is working ////////////////////////////////////////////////////// delay(1000); //Time between sensor readings to "clear the airwaves"... so to speak. Could be much less or maybe is not needed. /////////////////////////////////////////////////////// // The PING))) is triggered by a HIGH pulse of 2 or more microseconds. // Give a short LOW pulse beforehand to ensure a clean HIGH pulse: pinMode(pingPinRight, OUTPUT); digitalWrite(pingPinRight, LOW); delayMicroseconds(2); digitalWrite(pingPinRight, HIGH); delayMicroseconds(5); digitalWrite(pingPinRight, LOW);

// The same pin is used to read the signal from the PING))): a HIGH // pulse whose duration is the time (in microseconds) from the sending // of the ping to the reception of its echo off of an object. pinMode(pingPinRight, INPUT); duration = pulseIn(pingPinRight, HIGH);

// convert the time into a distance

cmR = microsecondsToCentimeters(duration); Serial.print(cmR); Serial.print("cmRIGHT"); Serial.println(); delay(100); digitalWrite (pingPinLeft, LOW); // I don't know if this command is necessary, but it would make sense so it doesn't continue // to read while the next sensor is working

}

long microsecondsToCentimeters(long microseconds){ // The speed of sound is 340 m/s or 29 microseconds per centimeter. // The ping travels out and back, so to find the distance of the // object we take half of the distance travelled. return microseconds / 29 / 2;}